• Title/Summary/Keyword: geophysics

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FREQUENCY DISTRIBUTION OF HII REGIONS RADII AS A DISTANCE INDICATOR

  • ISMAIL H. A.;ALAWY A. E.;TAKEY A. S.;ISSA I. A.;SELIM H. H.
    • Journal of The Korean Astronomical Society
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    • v.38 no.1
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    • pp.7-12
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    • 2005

  • The frequency distribution of HII regions radii in our galaxy has been investigated. The correlation between the number of these regions and their radii has been re-determined, and could be represented by an exponential function. The size distribution of the HII regions in 10 spiral galaxies has been derived and combined with that of our galaxy to derive the distances of these galaxies. It has been found that the distances derived are in a good agreement with the published ones. The interstellar extinction in the galaxies has no influence on the distance estimate when using this geometrical method.

  • https://doi.org/10.5303/JKAS.2005.38.1.007 인용 PDF KSCI

STATISTICAL GAUSSIAN DISTRIBUTION FUNCTION AS A DISTANCE INDICATOR TO STELLAR GROUPS

  • Abdel-Rahman, H.I.;Issa, I.A.;Sharaf, M.A.;Nouh, M.I.;Bakry, A.;Osman, A.I.;Saad, A.S.;Kamal, F.Y.;Essam, Essam
    • Journal of The Korean Astronomical Society
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    • v.42 no.4
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    • pp.71-79
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    • 2009

  • In this paper, statistical distribution functions are developed for distance determination of stellar groups. This method depends on the assumption that absolute magnitudes and apparent magnitudes follow a Gaussian distribution function. Due to the limits of the integrands of the frequency function of apparent and absolute magnitudes, we introduce Case A, B, and C Gaussian distributions. The developed approaches have been implemented to determine distances to some clusters and stellar associations. The comparison with the distances derived by different authors reveals good agreement.

  • https://doi.org/10.5303/JKAS.2009.42.4.071 인용 PDF KSCI